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Message-Id: <20250407032349.83360-1-bsdhenrymartin@gmail.com>
Date: Mon, 7 Apr 2025 11:23:49 +0800
From: Henry Martin <bsdhenrymartin@...il.com>
To: nbd@....name,
lorenzo@...nel.org,
ryder.lee@...iatek.com,
shayne.chen@...iatek.com,
sean.wang@...iatek.com,
matthias.bgg@...il.com,
angelogioacchino.delregno@...labora.com,
chui-hao.chiu@...iatek.com,
bsdhenrymartin@...il.com,
rex.lu@...iatek.com
Cc: linux-wireless@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: [PATCH v2] wifi: mt76: mt7996: Fix null-ptr-deref in mt7996_mmio_wed_init()
devm_ioremap() returns NULL on error. Currently, mt7996_mmio_wed_init()
does not check for this case, which results in a NULL pointer
dereference.
Prevent null pointer dereference in mt7996_mmio_wed_init()
Fixes: 83eafc9251d6 ("wifi: mt76: mt7996: add wed tx support")
Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
---
V1 -> V2: Add a blank after the check and correct the summary.
drivers/net/wireless/mediatek/mt76/mt7996/mmio.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mmio.c b/drivers/net/wireless/mediatek/mt76/mt7996/mmio.c
index 13b188e281bd..af9169030bad 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mmio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mmio.c
@@ -323,6 +323,9 @@ int mt7996_mmio_wed_init(struct mt7996_dev *dev, void *pdev_ptr,
wed->wlan.base = devm_ioremap(dev->mt76.dev,
pci_resource_start(pci_dev, 0),
pci_resource_len(pci_dev, 0));
+ if (!wed->wlan.base)
+ return -ENOMEM;
+
wed->wlan.phy_base = pci_resource_start(pci_dev, 0);
if (hif2) {
--
2.34.1
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